Pixelated Luminescent Rods for High Intensity Lighting
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Solution Overview
Problem
Existing lighting devices face challenges in achieving high light concentration and efficient cooling while minimizing cross-talk and heat sinking issues, especially when multiple luminescent rods are arranged in close proximity.
Innovation Solution
A pixelated luminescent rod configuration is proposed, where multiple rods are positioned in a tapered arrangement, each pumped by a separate LED array and enclosed by a heat sink, allowing for pixelated light distribution and avoiding cross-talks, with heat sinks arranged between the rods to facilitate efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple luminescent rods are arranged in close proximity to increase light concentration, then the light output intensity is improved, but heat sinking becomes difficult and cross-talk between rods increases
Solution Approach 1:
The lighting device is divided into multiple independent luminescent elements (rods), each with its own LED array and heat sink. This segmentation allows each rod to be cooled independently while maintaining close proximity for high light concentration, resolving the conflict between intensity and heat management.
Solution Approach 2:
The heat sink is integrated within the housing structure that contains the luminescent rods, with each rod nested within its own thermal management zone. This nested arrangement allows efficient heat sinking while maintaining compact spacing between rods for high light output intensity.
2Illumination intensity
If multiple luminescent rods are arranged in close proximity to increase light concentration, then the light output intensity is improved, but cross-talk between rods increases
Solution Approach 1:
Each luminescent rod is treated as an independent optical element with separate LED pumping and light extraction paths. This segmentation prevents optical cross-talk between adjacent rods while maintaining close spacing for high overall light concentration and intensity.
Solution Approach 2:
The harmful optical cross-talk is extracted and eliminated by providing separate optical paths and independent light extraction surfaces for each rod, allowing close proximity arrangement without interference between adjacent luminescent elements.
3Area of stationary object
If luminescent rods are arranged in a matrix configuration to increase emitting surface area, then the light distribution is improved, but the device complexity increases
Solution Approach 1:
Each luminescent rod is designed as a universal module that can be arranged in various configurations (including matrix arrangements) to achieve different emitting surface areas. The standardized modular design reduces device complexity while enabling flexible scaling of the emitting surface.
Solution Approach 2:
The emitting surface area is optimized by adjusting parameters such as rod dimensions, spacing, and arrangement configuration rather than fundamentally changing the device architecture. This parameter-based optimization achieves large emitting surfaces while maintaining manageable device complexity.
4Illumination intensity
If the luminescent rod length is increased to pump more blue LED's and increase green light brightness, then the light concentration is improved, but the device volume increases
Solution Approach 1:
Instead of increasing rod length in one dimension, the solution uses multiple shorter rods arranged in a matrix configuration. This dimensional transition from linear to areal arrangement achieves high green light brightness through increased total luminescent material volume while maintaining compact device footprint.
Solution Approach 2:
The single long rod is segmented into multiple shorter rods arranged in a matrix. This segmentation allows parallel pumping with multiple LED arrays, achieving high overall brightness while keeping each individual rod compact and the total device volume manageable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration achieves high intensity light output with a large emitting surface, efficient cooling, and effective arrangement of light sources, while maintaining a compact design by optimizing the spacing and orientation of luminescent elements.
Implementation Method 1
Under e.g. blue light radiation, the blue light excites the phosphor, after the phosphor start to emit green light in all directions
Implementation Method 2
Since the phosphor is embedded in - in general - a high refractive index bar, a main part of the converted (green) light is trapped into the high refractive index bar and wave guided to the nose of the bar
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The invention provides a lighting device (1) comprising (i) a plurality of sets (310) of each one or more light sources (10) configured to provide light source light (11), and (ii) a plurality of luminescent elements (5), each luminescent element (5) comprising an elongated luminescent body (100) having a radiation input face (111) for receipt of the light source light (11), each luminescent element (5) comprising a luminescent material (120) for conversion of at least part of the light source light (11) into luminescent material light (8), and each luminescent element (5) have an luminescent element exit window (12) for the luminescent material light (8); wherein the luminescent elements (5) are configured in a configuration wherein an average distance (d1) between neighboring luminescent bodies (100) is larger than a shortest luminescent element exit window distance (d2) between the neighboring luminescent element exit windows (12), thereby defining an interspace (320) between the neighboring luminescent bodies (100).